the first 4 ionisation energy values of an element are 191,578,872,5962 kcal.the number of valance electrons in the element is?
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Ionisation potential (IP) number 4 is very high it means it has achieved a noble gas configuration so it means that after 3 electrons it has achieved noble gas configuration and it doesn't want to lose another electron.. so it means it can lose upto 3 electrons hence valency is 3
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